Compound bolt.



freshen A. FRA'UENHEIM, or ZELIENOPLJE, PENNSYLVANIA, AssIeNoR T KERN]ER MANUFACTURING coNrANY, or rrr'rseunesr, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

To all whom it may concern Be it known that I, JOSEPH A. FRAUEN- HEIM, a citizen of the United States of America, residing at Zelienople, in the e county of Butler and State of Pennsylvania,

I in compound bolts having a plurality of members .either of which is arranged to move with relation to the other. 0

It is well known to those familiar with the art, and particularly with railway track construction, that various devices are used to keep the nuts. tight on the bolts, as the continual pounding .of the wheels on the joints of tracks, as well as the continual pounding on the switches and frogs, loosens the nuts holding the parts in their assembled position. i j

The bject'o'f my invention is to provlde a bolt in which one of the members of the bolt can move relative to the other member, thereby compensating for the twisting stresses to which the various members are subjected, which will avoid the loosening of the nuts on the bolts. I The precise nature of my invention Wlll be best understood by reference to the accompanying drawings, which will now be described, it being premised, however, that various changes may be made in the. details of construction of the bolt, without departing from the spirit and scope of my inven tion asset forth in the appended claims.

In the drawings, the reference numeral 2 '7 designates the two members of the bolt.

The ends of these membersl have shown as temporarily secured to each other bylgneans of pins 3' extending through thetwo 'mem-' bers.

In Fig. 1, lhave shown the ordinary form of track bolthaving ahead 4 and athreaded portion 5 at ..the other end.

In Fig. 2, l have shownspecification of Letters Patent.

ing tool.

a bolt which is,

ooMroUNn now.

provided with a threaded portion 6, 6, at

Patented Apr. f3, f llfi. Application filed January 27, 1914. Serial No. 814,702. I I

each end, and which is more particularly designed for securing the various members of a frog to'each other.

1 In making the bolt such as shown in Fig. 1, ll take two pieces of semicircular stock, preferably of. steel, and upset the half heads and shoulder portions on one end thereof. 1 then secure the members to each otherby means of the pins 3 close to the ends of the two members- One end of the bolt is then threaded, as indicated at5 in Figxl and after the. bolt is placed in position, the through pins, 3 may be driven out or separated, as indicated in Fig. 3. i The two members forming the bolt, are twisted about eachotherypreferably about -degrees and not to exceed 180 degrees, the

spiral of the twist extending in the opposite direction to the spiral of the threads on the nut 9 drawn tight, theends of the members are spread apart, and during'the spreading action, the pin 3 may be cut by the spread The pin 3 passing through the head can also be severed or driven out,and

I also true-of the faces of themembers against which the faces of the nuts and heads abut, so that very frequently the nut or head will only be in contact at one side of the center of the bolt. By the use of a structure such the bolt has been placed in position and the if the sanie is not removed, the movement as shown and described by ine, the nuts and bolt heads will seat on each side 0f ,.t he bolt, and thereby provide a bolt which isbetter adapted to retain the parts in position and prevent the nut from loosening.

ihe advantages of my invention result froin the provision of a bolt having a pluralityof members twisted about each other and which are arranged to move with, relation to each'other when secured in position. U

Further from the provision of a bolt in which the members are adapted to move relative to each other when the nut is rotated to unloose the same, which movement will tend to lock the nut from movement.

1. A bolt having a plurality of members which are separate throughout the entire length of the bolt, said members being twisted about the longitudinal axis of the golt, and screw threads on one end of said 2. A bolt having a pluralityof membersv which are separate throughout the entire length of the bolt, said members being twisted about the longitudinal axis of the bolt, screw threads on one end of said bolt, and a head on the-other end of said bolt.

3. A bolt having a plurality of separate members-threaded at one end, said members 1 being twisted about the longitudinal axis of the bolt, the spiral of the twist extending the reverse direction to the spiral of the thread. 4. A' bolt having a plurality of separate members threaded at one end, said members being twisted about the longitudinal axis of the bolt, the spiral of the twist extending the reverse direction to the spiral of the thread, and ahead on the other end of said bolt. r

In testimony whereof, I have hereunto set, my hand.

J. A. FRAUENHEIM. Witnesses: Jesse B. HELLER,

GEo. B. BLEMING. 

